JP2015128466A - dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dryer using a centrifugal type impeller having a structure capable of reducing the interference sound between the wind caused from the impeller and the other members.SOLUTION: A dryer 1 includes: a centrifugal type impeller 20; and a heater support part 40 for supporting a heater 50 ahead of the impeller 20. The impeller 20 includes a plurality of vanes 21 arranged annularly centering on a rotation axis 92. The heater support part includes a plurality of tabular parts 41. Each tabular part extends from the blow axis to various directions on a section orthogonal to the blow axis 91. In addition, the rear edges for all the tabular parts of the heater support part in the blow axis direction extends to the direction intersecting with an outer edge against the rotation axis 92 of the vane in the radial direction seen from the blow axis direction. That means, seen from the blow axis 91 direction, the outer edge of the vane 21 in the radial direction and the rear edge of all the tabular parts 41 for the heater support part are not in parallel. Thereby, the interference sound between wind to be blown forward from the vanes and the tabular part can be reduced.

Description

  The present invention relates to a dryer.

Conventionally, a dryer that blows hot air to dry or heat an object is known. A conventional dryer is described in, for example, Japanese Patent Application Laid-Open No. 2006-181297. The hair dryer of the publication has a blower unit and a heating structure inside the blower unit (see claim 1). The blower unit includes a turbo fan that is a centrifugal fan (see paragraph 0040). Further, the heating structure includes an insulating frame disposed closer to the exhaust port than the turbo fan, and a heater spirally wound around the insulating frame (see paragraph 0045).
JP 2006-181297 A

  In order to increase the air flow of the dryer, it is necessary to rotate the fan at high speed. However, for example, in the hair dryer disclosed in Japanese Patent Application Laid-Open No. 2006-181297, many members such as an insulating frame and a heater are disposed downstream of the fan in the main body case. In such a hair dryer, when the fan is rotated at a high speed, there is a problem in that a large interference sound is generated due to the wind generated from the fan hitting another member.

  The objective of this invention is providing the structure which can reduce the interference sound with the wind which arises from an impeller, and another member in the dryer using a centrifugal impeller.

  An exemplary first invention of the present application is a dryer that sends hot air forward along a blowing shaft extending in the front-rear direction, and is connected to a cylindrical portion extending in the front-rear direction around the blowing shaft and a rear portion of the cylindrical portion. An impeller accommodating chamber, a centrifugal impeller accommodated in the impeller accommodating chamber, a motor that rotates the impeller around a rotation axis that intersects a plane including the air blowing shaft, and the cylindrical portion are disposed. A heater support portion and a heater supported by the heater support portion in the cylindrical portion, and the impeller housing chamber has an intake port on at least one surface intersecting the rotation shaft, The impeller has a plurality of blades arranged in an annular shape around the rotation shaft, and the heater support portion has a plurality of plate-like shapes extending in a plurality of directions from the blower shaft in a cross section orthogonal to the blower shaft. And the edge of the plate-like part of the heater support part on the rear side in the air blowing axis direction is the edge on the radially outer side of the blade with respect to the rotation axis when viewed in the air blowing axis direction. It extends in the direction that intersects.

  According to the first exemplary invention of the present application, when viewed in the direction of the blower axis, the radially outer edge of the blade and the rear edge of all the plate-like parts of the heater support part are non-parallel. Thereby, the interference sound of the wind sent to the front from a blade | wing and a plate-shaped part can be reduced.

FIG. 1 is a side view of a dryer. FIG. 2 is a longitudinal sectional view of the dryer. FIG. 3 is a perspective view showing the internal structure of the dryer. FIG. 4 is an exploded perspective view of the heater support. FIG. 5 is a view of the impeller, the heater support portion, and the heater as viewed from the position of the white arrow A in FIG. 6 is a view of the impeller and the tongue as viewed from the position of the white arrow B in FIG. FIG. 7 is a cross-sectional view of the impeller, the heater support portion, and the heater according to the modification viewed from the same position as FIG. FIG. 8 is a cross-sectional view of the impeller, the heater support portion, and the heater according to the modification viewed from the same position as in FIG. FIG. 9 is a side view of a dryer according to a modification.

  Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the present application, a “fan shaft” is defined along the direction of the wind sent out by the dryer. In addition, the downstream side of the wind along the air blowing axis is “front”, and the upstream side of the wind is “rear”. However, this definition of the front-rear direction is not intended to limit the orientation when the dryer according to the present invention is used.

<1. Overall configuration of dryer>
FIG. 1 is a side view of a dryer 1 according to an embodiment of the present invention. FIG. 2 is a longitudinal sectional view of the dryer 1. FIG. 3 is a perspective view showing the internal structure of the dryer 1.

  The dryer 1 is a device that rotates the impeller 20 with the power of the motor 30 and sends hot air forward. The dryer 1 is used, for example, as a home or business hair dryer for drying hair. However, the dryer of the present invention may be a dryer for drying or heating other than hair, such as an industrial dryer. As shown in FIGS. 1 to 3, the dryer 1 of this embodiment includes a housing 10, a centrifugal impeller 20, a motor 30, a heater support portion 40, and a heater 50.

  The housing 10 includes a cylindrical portion 11, an impeller accommodating chamber 12, and a grip portion 13. The cylindrical portion 11 surrounds the periphery of the blower shaft 91 and extends in a cylindrical shape along the axial direction. The cylindrical portion 11 has an exhaust port 61 at the front end. The impeller accommodating chamber 12 is located behind the cylindrical portion 11. The space in the cylindrical portion 11 and the space in the impeller accommodating chamber 12 are connected to each other. The gripping portion 13 extends radially outward with respect to the blower shaft 91 from between the cylindrical portion 11 and the impeller accommodating chamber 12.

  As shown in FIGS. 1 and 2, in the present embodiment, the diameter of the cylindrical portion 11 is reduced toward the front in the axial direction. However, the diameter of the cylindrical portion 11 may be constant or may increase as it goes forward in the axial direction. Moreover, the cross-sectional shape of the cylindrical part 11 may be a substantially perfect circle, and other shapes, such as an ellipse and a rectangle, may be sufficient as it. Moreover, the cross-sectional shape of the cylindrical part 11 may change as it goes to the axial direction front.

  The impeller accommodating chamber 12 has a pair of side surfaces 121 that intersect with the rotating shaft 92 of the motor 30. These side surfaces 121 are each provided with an air inlet 62. When the dryer 1 is driven, air is sucked into the impeller chamber 12 through the air inlet 62. As shown in FIG. 1, the shape of the intake port 62 of the present embodiment is a substantially perfect circle when viewed in the direction of the rotation axis 92. However, the intake port 62 may have another shape such as a polygon, and may be configured by a large number of small holes. In addition, a filter may be attached to the air inlet 62 in order to prevent dust from entering the housing 10. Further, the air inlet 62 may be provided only in one of the pair of side surfaces 121 of the impeller accommodating chamber 12.

  The impeller 20 is a member that generates an air flow from the impeller housing chamber 12 toward the tubular portion 11 by rotating around the rotation shaft 92. The impeller 20 is accommodated in the impeller accommodating chamber 12. The impeller 20 is fixed to the rotor of the motor 30. The impeller 20 has a plurality of blades 21 arranged in an annular shape around a rotation shaft 92. In the present embodiment, each of the plurality of blades 21 extends in parallel with the rotation shaft 92. However, some or all of the blades 21 may be non-parallel to the rotation shaft 92.

  The motor 30 is a mechanism that supplies power for rotation to the impeller 20. In the present embodiment, the motor 30 is disposed on the radially inner side with respect to the rotation shaft 92 of the plurality of blades 21. When the motor 30 is driven, torque about the rotation shaft 92 is generated by the magnetic force between the coil and the magnet disposed in the motor 30. As a result, the rotor rotates about the rotation shaft 92 with respect to the stator of the motor 30. In the present embodiment, the rotating shaft 92 of the motor 30 extends in a direction orthogonal to the plane including the blower shaft 91.

  In the present embodiment, a brushless DC motor is used as the motor 30. A brushless DC motor has a longer life than a motor with a brush because there is no performance deterioration due to wear of the brush. Further, the brushless DC motor is easier to shift than the AC motor, and it is easy to reduce power consumption. However, instead of the brushless DC motor, a motor with a brush or an AC motor may be used.

  The heater support portion 40 is disposed in the cylindrical portion 11. The heater support portion 40 has four plate-like portions 41 that spread radially around the blower shaft 91. When viewed in a cross section orthogonal to the blower shaft 91, each of the four plate-like portions 41 extends substantially linearly outward from the blower shaft 91 in the radial direction. In the present embodiment, the four plate-like portions 41 are arranged at substantially equal angular intervals around the air blowing shaft 91 in a cross section orthogonal to the air blowing shaft 91.

  FIG. 4 is an exploded perspective view of the heater support 40. As shown in FIG. 4, in the present embodiment, the heater support portion 40 is configured by combining two support plates 42. The two support plates 42 are fixed to each other, for example, by fitting the notches 421 provided in each support plate 42 together. Each support plate 42 includes a pair of plate-like portions 41 extending on opposite sides with respect to the air blowing shaft 91. Thus, the four plate-like portions 41 are arranged around the air blowing shaft 91 at an angular interval of approximately 90 °. Thus, if the support plate 42 including the pair of plate-like portions 41 is combined, the number of parts of the heater support portion 40 can be reduced. However, the plurality of plate-like portions 41 may be separate members.

  The heater 50 is a heat source for heating the wind generated from the impeller 20. For the heater 50, for example, a heating wire such as a nichrome wire that generates heat when energized is used. The heater 50 is disposed in the cylindrical portion 11 and is supported by the heater support portion 40. Specifically, the heater 50 is hooked in a notch (not shown) provided in the plate-like portion 41. Note that the heater 50 may be wound around the four plate-like portions 41 by being wound around the radially outer edge of the plate-like portion 41.

  When the power switch of the dryer 1 is turned on, current is supplied to the motor 30 and the heater 50. As a result, the motor 30 is started, and the rotor and the impeller 20 of the motor 30 rotate around the rotation shaft 92. If it does so, gas will be accelerated by the several blade | wing 21 and the wind which goes to the cylindrical part 11 from the impeller storage chamber 12 will arise. Further, the wind sent forward in the cylindrical portion 11 is heated by the heat of the heater 50. The heated wind is blown out from the exhaust port 61 to the front of the tubular portion 11.

<2. Air flow in impeller chamber>
Next, the flow of air in the impeller accommodating chamber 12 will be described.

  As shown in FIG. 2, the internal space of the impeller accommodating chamber 12 includes a swirl passage 122 that extends in an arc shape in a cross section orthogonal to the rotation shaft 92. The swirling flow path 122 is located radially outside the impeller 20 with respect to the rotation shaft 92. That is, the swirl flow path 122 is interposed between the radially outer edge (hereinafter simply referred to as “outer edge”) 211 of the plurality of blades 21 with respect to the rotation shaft 92 and the inner wall surface of the impeller accommodating chamber 12. To do. When the impeller 20 rotates, the air sucked from the intake port 62 is collected in the swirl flow path 122 by the plurality of blades 21. And the said air is sent to the cylindrical part 11 side like the broken line arrow F in FIG. 2, accelerating | stimulating.

  The housing 10 has a tongue portion 14 at the boundary between the cylindrical portion 11 and the impeller accommodating chamber 12. The tongue portion 14 has an end side 141 that is closer to the outer peripheral portion of the impeller 20 than other portions of the housing. By having such a tongue part 14, it is suppressed that the airflow of the broken-line arrow F continues recirculating | refluxing around the impeller 20. FIG. That is, the wind generated by the blades 21 is guided in the direction of the air blowing shaft 91 by the tongue portion 14. Further, the radial width W of the swirl passage 122 with respect to the rotation shaft 92 gradually increases from the vicinity of the tongue portion 14 along the rotation direction of the impeller 20. As a result, the air accelerated by the impeller 20 is efficiently sent into the cylindrical portion 11.

  As described above, the dryer 1 of the present embodiment has a structure that can increase the blowing rate by efficiently sending air into the cylindrical portion 11. However, when the air flow rate of the dryer 1 is increased, the interference sound generated when the wind hits the members in the dryer 1 also increases. Below, the structure for reducing the said interference sound is demonstrated.

<3. Structure for reducing interference sound>
5 is a view of the impeller 20, the heater support portion 40, and the heater 50 as viewed from the position of the white arrow A in FIG.

  As described above, the impeller 20 has a plurality of blades 21. In the present embodiment, the outer edge 211 of each blade 21 is disposed substantially parallel to the rotation shaft 92. When the impeller 20 rotates, the gas accelerated by each blade 21 is concentrated in the vicinity of the outer edge 211 of the blade 21 and is sent from the outer edge 211 in the centrifugal direction. At this time, the wind generated from the outer edge 211 of each blade 21 spreads in the direction of the rotation axis 92.

  On the other hand, the heater support portion 40 of the present embodiment extends in a direction in which the rear end edges 411 of all the plate-like portions 41 intersect the outer end edge 211 of the blade 21 when viewed in the direction of the blower shaft 91. . That is, in the present embodiment, the outer end edge 211 of the blade 21 and the rear end edges 411 of all the plate-like parts 41 of the heater support part 40 are not parallel to each other when viewed in the direction of the blower shaft 91. For this reason, the wind which arises from each blade | wing 21 does not impinge on the rear-end edge 411 of the plate-shaped part 41 simultaneously over the full width of the rotating shaft 92 direction. Therefore, the interference sound between the wind sent forward from the blades 21 and the plate-like portion 41 is reduced.

  Here, when the number of plate-like portions 41 included in the heater support portion 40 is N, in this embodiment, N = 4. Assuming that N is an even number, the pair of plate-like portions 41 can be realized by a single support plate 42 as described above. However, if N = 2, the angular interval between the adjacent plate-like portions 41 is 180 °, so that it is extremely difficult to pass the heater 50 between the adjacent plate-like portions 41. Therefore, in this embodiment, N = 4 as the minimum number that uses the support plate 42 and easily supports the heater 50.

  Further, when the number N of the plate-like portions 41 included in the heater support portion 40 is an even number of 4 or more and the plurality of plate-like portions 41 are arranged around the blow shaft 91 at substantially equal angular intervals, the direction of the blow shaft 91 The minimum angle formed by the blade 21 and the plate-like portion 41 when viewed in the above cannot be made larger than 45 °. In the present embodiment, N = 4, and an angle θ smaller than the right angle formed by the direction in which each of the four plate-like portions 41 extends and the direction in which the blades 21 extend when viewed in the direction of the air blowing shaft 91. , Approximately 45 °. That is, the angle formed by the blade 21 and the plate-like portion 41 when viewed in the direction of the blower shaft 91 is the maximum possible value. Thereby, the interference sound with the wind sent from the blade | wing 21 ahead and the plate-shaped part 41 is reduced more.

  6 is a view of the impeller 20 and the tongue portion 14 as seen from the position of the white arrow B in FIG.

  As shown in FIG. 6, in this embodiment, the outer edge 211 of the blade | wing 21 and the edge 141 of the tongue part 14 are extended in a mutually different direction. In other words, the outer edge 211 of the blade 21 and the end 141 of the tongue 14 are not parallel. For this reason, the wind generated from each blade 21 does not simultaneously strike the end side 141 of the tongue 14 over the entire width in the direction of the rotation axis 92. Therefore, the interference sound between the wind generated by the blades 21 and the tongue portion 14 is reduced.

<4. Modification>
As mentioned above, although exemplary embodiment of this invention was described, this invention is not limited to said embodiment.

  FIG. 7 is a cross-sectional view of the impeller 20A, the heater support portion 40A, and the heater 50A according to one modification as viewed from the same position as that in FIG. In the example of FIG. 7, the heater support portion 40A has six plate-like portions 41A. For this reason, the angle interval of adjacent plate-like part 41A becomes narrower than the case where there are four plate-like parts. Therefore, the heater 50A can be supported more stably between the adjacent plate-like portions 41A.

  In the example of FIG. 7 as well, the rear edge 411A of all the plate-like portions 41A of the heater support portion 40A extends in a direction intersecting with the outer edge 211A of the blade 21A when viewed in the direction of the air blowing shaft 91A. . That is, when viewed in the direction of the blower shaft 91A, the outer end edge 211A of the blade 21A and the rear end edges 411A of all the plate-like portions 41A of the heater support portion 40A are non-parallel. For this reason, the wind which arises from each blade | wing 21A does not impinge on the rear-end edge 411A of plate-shaped part 41A simultaneously over the full width of a rotating shaft direction. Therefore, the interference sound between the wind sent forward from the blade 21A and the plate-like portion 41A is reduced.

  FIG. 8 is a cross-sectional view of an impeller 20B, a heater support portion 40B, and a heater 50B according to another modification when viewed from the same position as FIG. In the example of FIG. 8, the heater support portion 40B has four plate-like portions 41B. However, there are a narrow portion and a wide portion in the angular interval between the adjacent plate-like portions 41B. That is, the four plate-like portions 41B are arranged at non-uniform angular intervals around the air blowing shaft 91B in a cross section orthogonal to the air blowing shaft 91B. In this way, the angle θ formed by all the plate-like portions 41B and the blades 21B can be made larger than 45 °. Therefore, the interference sound between the wind sent forward from the blade 21B and the plate-like portion 41B can be further reduced.

  FIG. 9 is a side view of a dryer 1C according to another modification. In the example of FIG. 9, a substantially elliptical intake port 62 is provided on the side surface 121C of the impeller accommodating chamber 12C when viewed in the direction of the rotation shaft 92C. In the example of FIG. 9, one end of the long axis 622C of the air inlet 62C is arranged so as to approach the cylindrical portion 11C side. Specifically, one end of the long axis 622C of the air inlet 62C is more forward than a plane S1 including the rotation shaft 92C and perpendicular to the air blowing shaft 91C, and including the rotation shaft 92C and parallel to the air blowing shaft 91C. Located on the blower shaft 91C side. For this reason, the air sucked from the vicinity of the one end of the long shaft 622C in the air inlet 62C is efficiently sent into the cylindrical portion 11C. As a result, the air flow rate of the dryer 1C can be increased.

  The detailed shape of each member constituting the dryer may be different from the shape shown in each drawing of the present application. Moreover, you may combine suitably each element which appeared in said embodiment and modification in the range which does not produce inconsistency.

  The present invention can be used for a dryer.

DESCRIPTION OF SYMBOLS 1,1C Dryer 10 Housing 11 Tubular part 12 Impeller accommodating chamber 13 Grasping part 20 Impeller 21, 21A Blade 30 Motor 40, 40A Heater support part 41, 41A, 41B Plate-like part 42 Support plate 50, 50A Heater 61 Exhaust port 62 , 62C Inlet 91, 91A, 91B, 91C Blower shaft 92, 92A, 92C Rotating shaft 121 Side surface of impeller accommodating chamber 122 Swirling flow path 141 End of tongue 211, 211A Outer edge of blade 411A After plate Edge 622C Long axis of air inlet

Claims (10)

A dryer that sends hot air forward along a blowing shaft extending forward and backward,
A cylindrical portion extending back and forth around the blower shaft;
An impeller housing chamber connected to the rear of the tubular portion;
A centrifugal impeller housed in the impeller housing chamber;
A motor that rotates the impeller around a rotation axis that intersects a plane that includes the blower shaft;
A heater support disposed in the cylindrical portion;
A heater supported by the heater support in the tubular portion;
Have
The impeller accommodating chamber has an intake port on at least one surface that intersects with the rotation shaft,
The impeller has a plurality of blades arranged in an annular shape around the rotation axis,
The heater support portion has a plurality of plate-like portions extending in a plurality of directions from the blower shaft in a cross section orthogonal to the blower shaft,
Ends of the plate-like portions of the heater support portions that are rearward in the air blowing axis direction intersect with radial outer edges of the blades with respect to the rotating shaft when viewed in the air blowing axis direction. Dryer that extends to. The dryer according to claim 1, wherein
The plurality of plate-like portions are dryers arranged at substantially equal angular intervals around the blower shaft in a cross section orthogonal to the blower shaft. The dryer according to claim 2,
The heater support portion has a plurality of support plates,
Each of the plurality of support plates includes a pair of plate-like portions extending on opposite sides with respect to the air blowing shaft. The dryer according to claim 3,
The heater support part has four plate-like parts,
A dryer in which an angle smaller than a right angle formed by a direction in which each of the four plate-like portions extends and a direction in which the blades extend is approximately 45 ° when viewed in the air blowing axis direction. The dryer according to claim 3,
The heater support part is a dryer having six plate-like parts. The dryer according to claim 1, wherein
The plurality of plate-like portions are dryers arranged at non-uniform angular intervals around the blower shaft in a cross section orthogonal to the blower shaft. The dryer according to any one of claims 1 to 6,
Each of the plurality of blades is a dryer extending in parallel with the rotation axis. The dryer according to any one of claims 1 to 7,
A boundary portion between the cylindrical portion and the impeller-accommodating chamber, further comprising a tongue portion having an end near the outer peripheral portion of the impeller;
A dryer in which the end side of the tongue portion and the radially outer edge of the blade with respect to the rotation axis extend in different directions. The dryer according to claim 8,
The internal space of the impeller accommodating chamber includes a swirl flow path positioned radially outward with respect to the rotation shaft with respect to the impeller
A dryer in which the radial width of the swirl passage gradually increases from the vicinity of the tongue along the rotation direction of the impeller. The dryer according to claim 9, wherein
The inlet is substantially oval,
One end of the long axis of the intake port is in front of the plane that includes the rotation axis and is orthogonal to the blower axis, and in front of the plane of the blower axis, and more than the plane that includes the rotation axis and is parallel to the blower axis A dryer located on the side.

Images